VOL 79, No. 3 (2006)

Lump formation in a double-alkali glass batch for insulating glass during storage in the cold has been investigated. Technological modes of two-stage preliminary mixing of sand with water and alkali-containing components in the preparation of the charge are proposed. The effect of water temperature and pre-mixing modes on charge lump formation has been studied. Technological recommendations are given for optimizing the mode of preliminary two-stage mixing of the charge. Tab. 1, ill. 1, bibliography: 3 titles.

M?ssbauer spectroscopy revealed the presence of titanomagnetites and magnesian olivine in technological samples of basalt fiber production. These impurities can cause degradation of the fiberglass in the duplex process. Tab. 2, ill. 2, bibliography: 2 titles.

A comparative study of the processes of phase formation of aluminum and chromo-magnesium spinels obtained from chemically precipitated mixtures has been carried out. It is shown that a significant difference in the formation of these spinels during heat treatment is due to the interaction of MgO and Al ₂ O ₃ during deposition, leading to the formation of crystalline hydrate Mg ₅ Al ₄ O ₁₁ & times; 15Н ₂ O. The formation of chromium-magnesium spinel is much slower and requires higher temperatures. It has been found that the fine chemical synthesis of MgOx; Al ₂ O ₃ and MgOx; Cr ₂ O ₃ contributes to a decrease in the temperature of completion of their formation by 400 - 500 and 150 - 200 ° C, respectively, in comparison with traditional solid-phase synthesis. Il. 2, bibliography: 16 titles.

It is shown that by introducing granodiorite from the Seversky granite quarry, regulating the grain size composition of the masses and using a combined method for preparing raw materials based on the clay of the Buskul deposit, it is possible to obtain acid-resistant bricks with stable properties and dimensions, with a higher strength (105 MPa) and low shrinkage (6.3 %). All properties of such products meet the requirements of GOST 474-90 for acid-resistant bricks of class A. Tab. 5, ill. 1, bibliography: 3 titles.

It was found that dextrin, which is part of the cobalt-containing paint, affects the quality of decorated ceramic products. Its content determines the likelihood of such defects as paint peeling and "cobalt metallization". With an increase in the amount of dextrin in the paint and an increase in its adhesive ability, the thickness of the glaze layer at the places where the paint is applied decreases, and the viscosity, contact angle and porosity of the glaze also decrease. It is recommended to add 13% dextrin to cobalt-containing paint. Tab. 4, ill. 3, bibliography: 1 title.

The possibility of using glauconite additives in the production of ceramics and their influence on the intensity of coloring of ceramics have been studied. It is shown that the effect of glauconite additives on the color of fired products depends on the composition of the clay, the amount of the additive, its specific surface area and the firing mode - the rate of temperature rise, maximum temperature, as well as the duration of firing. Tab. 2, ill. 3, bibliography: 8 titles.

Using the linear regression method, it was found that the optimal content of light fraction ash in the compositions of ceramic masses for the production of facade tiles from technogenic raw materials without the use of traditional natural materials is 47 - 48%. Tab. 2, ill. 1, bibliography: 4 titles.

The influence of the method of introducing the catalyst on the nature of phase formation in glass-crystalline materials obtained by the method of ceramic technology from glass of spodumene composition, welded in a solar oven, has been studied. The main characteristics of sitalls are determined. It is shown that when a catalyst is introduced during glass synthesis, the optimal phase composition, which determines the properties of glass-crystalline materials, is formed at lower sintering temperatures. It has been established that ceramic technology can be used to obtain sitalls with good dielectric characteristics. Tab. 2, ill. 1, bibliography: 2 titles.

Natural diatomite rocks have been investigated. Studied their structure, mineralogical features, chemical composition, phase transformations during heat treatment. It is shown that diatomite rocks are a promising raw material for enameling production. Tab. 1.

Calcium phosphate materials are finding increasing use for bone replacement and treatment. The influence of the phase and chemical (ionic) compositions on the biomedical properties (bioresistivity and bioresorbability) of such materials is considered. The principles of the formation of the microstructure of bioceramics, as well as possible directions of chemical modification of calcium phosphates with biocompatible anions and cations are outlined. Tab. 1, ill. 1, bibliography: 12 titles.

A model of material flows in the production of glass containers is considered. A method for standardizing the consumption of cullet and raw materials of the glass batch is proposed. Il. 1, bibliography: 2 titles.